<template>
  <el-container class="home">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="loginOut">退出</el-button></el-header
    >
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏区域 -->
      <!--  宽度根据isCollapse动态切换 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 折叠菜单按钮 -->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409BFF"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
          <!-- 一级菜单的模板区域 -->
          <el-submenu
            :index="item.path + ''"
            v-for="item in menulist"
            :key="item.id"
          >
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item
              :index="'/' + subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/' + subItem.path)"
            >
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: "Home",
  data() {
    //   获取菜单***
    return {
      //   左侧菜单数据
      menulist: [],
      iconObj: {
        125: "iconfont icon-group_fill",
        103: "iconfont icon-computer_fill",
        101: "iconfont icon-shop_fill",
        102: "iconfont icon-activity_fill",
        145: "iconfont icon-dynamic_fill",
      },
      // 是否折叠菜单
      isCollapse: false,
      // 被激活的地址
      activePath:'',
      
    };
  },
  created() {
    this.getMenuList();
    this.activePath =window.sessionStorage.getItem('activePath')
  },
  methods: {
    loginOut() {
      // 清空token
      window.sessionStorage.clear();
      // 随后跳转到登陆页面即可
      this.$router.push("/login");
      this.$message.error("账号已登出");
    },
    // 获取所有菜单***
    async getMenuList() {
      const { data: res } = await this.$http.get("menus");
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg);
      this.menulist = res.data;
      console.log(res);
    },
    // 点击菜单折叠展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    // 保存链接的激活状态
    saveNavState(activePath){
    window.sessionStorage.setItem('activePath',activePath)
    this.activePath =activePath
    }
  },
};
</script>

<style lang="less" scoped>
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  //   按钮上下不贴边
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  transition: all 0.5s;
  // 解决边框线对不齐的效果
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.home {
  height: 100%;
}
// 一级菜图标间距
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  // 行高
  line-height: 24px;
  color: #fff;
  text-align: center;
  // 文本间间隔
  letter-spacing: 0.2em;
  // 鼠标放上去变点击状态
  cursor: pointer;
}
</style>